print('名片管理系统v1.0'.center(20))
print('1.添加名片')
print('2.删除名片')
print('3.修改名片')
print('4.查询名片')
print('5.显示所有名片')
print('6.退出系统')
all=[{}]
x=int(input())
if x==1:
    pass
if x==2:
    pass
if x==3:
    pass
if x==4:
    pass
if x==5:
    pass
if x==6:
    print('您确定要退出系统吗yes or no ')
    answer=input()
    if answer=='no':
        exit()
    else:
     pass

